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CLEANSTART-2026-VJ96840 — Security fix for CVE-2026-42576 applied in: melange 0.50.0-r1

Affected: CleanStart: melange

Security vulnerability affects the melange package. This issue is resolved in later releases. See references for vulnerability details.

EUVD-2026-309910

fkie_cve-2026-42576

apko allows users to build and publish OCI container images built from apk packages. Prior to version 1.2.7, DiscoverKeys in pkg/apk/apk/implementation.go unconditionally type-asserts JWKS keys as *rsa.PublicKey without checking the key type. If a repository JWKS endpoint returns a non-RSA key (e.g. EC), the unchecked assertion panics and crashes apko. This affects any workflow that initializes the APK database and fetches repository keys. This issue has been patched in version 1.2.7.

GHSA-m7hm-vm4x-28jf — apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery

Affected: Go: chainguard.dev/apko

`DiscoverKeys` in `pkg/apk/apk/implementation.go` unconditionally type-asserts JWKS keys as `*rsa.PublicKey` without checking the key type. If a repository JWKS endpoint returns a non-RSA key (e.g. EC), the unchecked assertion panics and crashes apko. This affects any workflow that initializes the APK database and fetches repository keys. Affected versions <= 0.30.34.

**Fix:** No fix available yet.

**Acknowledgements**

apko thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.